One thing that I really noticed at PAI is that they're flexible. They state this explicitly now in terms of their surgery, no longer describing a singular technique. This relates in part to the fact that they have a team of top surgeons and also to what Warlockmaker described elsewhere: that as the paying client you can push for what you want. I have little doubt, for instance, that if you wanted an emphasis on as realistic a fourchette as possible they would deliver. Concretely I know they will consider various graft techniques if required.
One of the few peer-reviewed academic studies on Thailand GRS notes the way in which techniques at PAI have evolved: 'The surgical technique for vaginoplasty and clitoro-labioplasty used at the Chulalongkorn University and at the PAI in Bangkok is the evolution of several refinements implemented to the original inversion peno-scrotal technique'
1975 Primitive inverted peno-scrotal flap
1983 Posterior urethral flap (To prevent urethra stenosis and to give some mucosa tissue to vaginal introitus)
1990 Total resection of the corpus spongiosum (To allow penetration without swelling during sexual arousal)
1999 Surgicel onto urethra clitoris (To prevent bleeding)
2000 Bottoming out suture on the top of clitoris (Appearance of the clitoral body)
2003 Prepucial skin (Reconstruction of the clitoral hood)
2003 M-shaped glans flap (Shaping of the clitoris)
2005 Perineal stitch to fix the scrotal flap to the rectal wall (Prevention of (minor) scrotal flap prolapse)
'Preecha's team refinements consist of: (1) cavity dissection with blunt technique; (2) the use of skin graft in addition to the penile flap; (3) shaping of the clitoris with abundant prepucial foreskin; and (4) urethra mucosa to line the anterior fourchette.'
'In the period 1975–2013, Preecha's group (Bangkok, Thailand) performed nearly 3000 vaginoplasties in male-to-female transsexuals.
In the present manuscript we describe in details the surgical technique currently in use by the same group (Chulalongkorn University and "Preecha Aesthetic Institute" (PAI), Bangkok). Preecha's technique is comprised of several surgical refinements added during the past 39 years of practice by Dr Preecha and his team colleagues.'
'With the refinements introduced, it has been possible to achieve a result that is very close to the biological female genitalia.'I cannot link to the full article as it contains graphic pictures of the operation. However, the safe abstract can be seen here:
http://www.ncbi.nlm.nih.gov/pubmed/25356769